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-   -   Kart AKU83 from Russia. (http://www.diygokarts.com/vb/showthread.php?t=39944)

chados 09-05-2018 03:53 AM

Kart AKU83 from Russia.
 
Hello, dear forum users! I dare to start a project diary.
In the beginning, I think you can take this topic where I introduced myself. Immediately I will talk about working on pictures, as well as about participating in competitions.
http://www.diygokarts.com/vb/showthread.php?t=39419

My carting was AKU-83 from the 80s of the USSR.
Motor Chinese Lifan 168F2 (6.5 hp) clone Honda 200cc,
Carburettor Chinese clone 22 mm
A new exhaust system has been welded.
Automatic coupling with a ratio of 1/2
The leading star of 13 teeth set into motion 27.
Wheels 5 inches. Tire splices.

At the moment improvements are being improved, as well as necessary repairs.

In this season I participated in 3 races, 2 of them chased for 1 hour for endurance, and the second was standard for 3 races in 10 minutes.
I have not received any prizes, I'm still just starting to learn how to properly manage, and karting is not powerful enough to overtake rivals, they have very developed engines. The chassis has old age, in terms of quality and tuning it is much inferior to the new modern chassis. But I'm not upset, we have a small budget, and I do it for myself, for the soul. I also help children to collect their karting, and to repair them.

In the next few days I will post photos and descriptions.:welcome2:

chados 09-05-2018 07:41 PM

2 Attachment(s)
After a monthly break, I returned to a workshop again, and found out that a leakage the brake cylinder. Piston cuff is worn out, I found a cup in shop, but they were bad quality therefore I ordered in other place, now it in way I expect.

2 photos - What kind of exhaust I use.

itsid 09-05-2018 09:23 PM

chances are you can't win because you geared way too high
(currently 4.15:1)

add 5 or better 7 more teeth to your axle sprocket (i.e 32 or 34)
and your kart will accelerate MUCH quicker!

Acceleration is way more important than top speed on most kart tracks.

'sid

chados 09-05-2018 09:58 PM

Quote:

Originally Posted by itsid (Post 507904)
chances are you can't win because you geared way too high
(currently 4.15:1)

add 5 or better 7 more teeth to your axle sprocket (i.e 32 or 34)
and your kart will accelerate MUCH quicker!

Acceleration is way more important than top speed on most kart tracks.

'sid

Thank you, I understood you, I think about it.
The problem is that with more acceleration I can have limitations on engine speed, I have a standard connecting rod, I'm afraid to break it.

I'm thinking of putting a centrifugal arrangement without dividing 1/2, so I can have a margin for engine speed.

itsid 09-05-2018 10:21 PM

No, nonono..

Either you have a terrible misconcept or (as likely) I misunderstood your post

Acceleration is NOT an issue for your conrod,
there are only two things that will affect your conrod, high rpms and/or high compression ratios.
both will stress the engine internals and cause troubles if not accounted for.

DO NOT replace the wet clutch!
it's likely the most durable clutch there is on the market (300++ dollar racing clutches aside)
and the 2:1 reduction is a huge benefit when it comes to ground clearance.

and the engine speed (rpm) isn't affected if you remove the 2:1 reduction ..
in fact it'd be worse since any dry clutch (standard cent clutch ... even expensive racing versions)
will need the same overall gear ratio (likely even lower!)

you cannot run a dry clutch with 13->27 sprockets and hit the same speed at much lower rpms,
in fact you will only burn the clutch and wouldn't move at all!

'sid

chados 09-06-2018 12:35 AM

1 Attachment(s)
Yes, maybe the difficulties of translation, I wanted to say that for me, not only acceleration, but also speed, the routes that now have long straight segments or smooth high-speed turns, I rest on 6000 RPM, reaching a speed of 70km / h, But the rivals are going faster than 80+ km /h.

Of course on a dry clutch other gear ratio, and change of asterisks is necessary absolutely, I understand it, thank you for councils!
I made a calculation in the table by my parameters, by which you can substitute different numbers of gears and output speed and speed. I was mistaken, counted, the front star 12 and not 13.

I'll find a video from the camera's GOPRO, with rivals, I'll try to show.

itsid 09-06-2018 04:33 AM

long stretches are indeed also asking for top speed of course,
but that's not how races are won most of the time ;)
what wins a race is "average speed" and to keep that up quick acceleration is more important!

time four to five laps on the race track with your current setup,
add four teeth to the axle sprocket and do the same.
Then decide.

Anyways.. if you want to gain speed, you will have to modify the engine further..
(billet conrod, flywheel; stiffer valve springs, maybe a new camshaft)
7200 - 7500 rpm should be doable without spending a fortune

And since you have a true Honda clone, you can just install parts made for a Honda gx200
which luckily are plenty.

'sid

chados 09-06-2018 06:37 AM

Quote:

Originally Posted by itsid (Post 507914)
long stretches are indeed also asking for top speed of course,
but that's not how races are won most of the time ;)
what wins a race is "average speed" and to keep that up quick acceleration is more important!

time four to five laps on the race track with your current setup,
add four teeth to the axle sprocket and do the same.
Then decide.

Anyways.. if you want to gain speed, you will have to modify the engine further..
(billet conrod, flywheel; stiffer valve springs, maybe a new camshaft)
7200 - 7500 rpm should be doable without spending a fortune

And since you have a true Honda clone, you can just install parts made for a Honda gx200
which luckily are plenty.

'sid

Thanks for the explanation, I'll try to do this when I find the right star.
Tell me, please, where can I buy the tuning details with delivery to Russia?


Yes, you are right, I now watched the video and decided that I do not have enough accelerations and fast corners.
Here is a link to the video, I do not know how to place it here with a window. :(
https://youtu.be/L27_ItGH1pY
[EDIT -sid-]
just as you did but with the full link url:
https://www.youtube.com/watch?v=L27_ItGH1pY
Freeware website:

itsid 09-06-2018 10:44 AM

Sorry, I can't be of much help with the online sources...

searching for an online source will be a bit tedious;
since the best results for you are the ones you'll find searching in your own language ;)

as far as I know
arc racing ships internationally:
https://www.arcracing.com/shipping-returns/
so does nr racing
https://www.nrracing.com/shipping-a/257.htm

I think even https://affordablegokarts.com/ does so...

shipping and handling will be expensive since you're pretty much on the opposite side of this planet.

That's why it's best to check for some sources closer to your location,
Ask your competitors where they bought their parts if they run a similar engine;
maybe they know a local store or online shop.

'sid

anderkart 09-07-2018 07:28 AM

I agree with sid.

But you also really need to improve your driving style around corners.
You need to be cornering more like that kart in front of you in your video.

Spend some time watching how the fastest guys corner at your track, and learn from them.
You could also watch a bunch of youtube videos (like yours) of karts racing on other tracks... :thumbsup:

itsid 09-07-2018 08:23 AM

@1:30 in the video one can clearly hear and see how bad your acceleration is...(gearing!)
and that costs you at least 2 seconds in just that corner...

And while skill comes with experience (which is always a good thing to improve)
it's at least partly the gearing that is slowing you down.

Whenever you have the feeling you need more power on the track;
what you are missing is TORQUE, and that can be improved by gearing down (bigger axle sprocket)

'sid

chados 09-07-2018 09:11 AM

5 Attachment(s)
Thank you for the information and advice, it is very valuable to me.
I will improve my abilities, so I plan to go in winter, I'm already looking for winter tires. We have winter in Siberia for 5-6 months, and many winter tracks appear, both ice and snow.

Some tuning details I found on ebay, and looked in stores that pointed to Sid, thanks I now know what is needed.

Today I found the star 34, I will put it, also the star 13,14. I will make an adapter on my axis.

I have a strengthened centrifugal clutch, it withstands a heavy load and has great inertia, it is very heavy in weight. In our workshop it is used for children's mini buggies as well as with a motor clone of 200cc.

itsid 09-07-2018 08:58 PM

Do not increase the number of teeth on the clutch sprocket...
that's lessening the effect or even making it worse!

increase the axle sprocket
or DECREASE the clutch sprocket

with your 2:1 ratio wet clutch you want the axle divided by clutch to approach 3..

currently it's 2.25
27/12 = 2.25 (with 2:1 wet clutch that's 4.5:1)

with the 34 rear sprocket it'll be 2.83
34/12 = 2.83 (with 2:1 wet clutch that's 5.67:1)
which to me sounds like a decent ratio to try with a wet clutch..


if however you increase the clutch sprocket you only reach 2.43
34/14 = 2.43 (with the 2:1 wet clutch you end up at only 4.86:1)
which is not much of an improvement really

I'd say no less than 5.5:1 is what you want for decent acceleration

The dry clutch you have (for the kid's buggies) has if I'm not miscounting 8 teeth..
even with your larger axle sprocket that's only 4.25:1 ratio
since you have lsot the 2:1 reduction benefit it stays at that terrible number
and will end up much worse than what you currently have.
(especially since you lost the oil part, and the clutch will glace over in no time and just burn out)

'sid

chados 09-10-2018 09:57 PM

7 Attachment(s)
Hello dear members of the forum.

Today I dismantled the rear axle, took off the stars, I will make an adapter for the star 34.

I also wanted to show a little of our workshop. We have a lathe from the 60s of the USSR, it is not as accurate as before, we try to keep it in working order.

Kartingi and buggy for children.

chados 09-17-2018 06:38 AM

5 Attachment(s)
Hello, members of the forum!
Today they made the star 34.
Have mounted on karting. And found a crack in the hub, so I could not test drive.
Also today came the children from the new school year.

chados 09-23-2018 10:27 AM

yesterday the race was held for 1 hour, but we could not go, our teacher lost the documents for the car and the driver's license. And there is no other car for transportation. the next race is 29.09, but already a simple 3 race for 10 minutes.

landuse 09-25-2018 02:35 AM

That sucks! Hopefully you can go to the next race

itsid 09-25-2018 06:37 AM

yeah that's serious misfortune :(

I'd love to know what you think of the changed gear ratio...
hopefully you can attend the race this saturday to find out.

'sid

chados 09-26-2018 10:10 AM

2 Attachment(s)
Today installed a tachometer, and preparations for the race began on 29.09. Removed excess weight, now kart weighs 70kg and I'm 58kg.

Yes, we plan to attend the race on 29.09, I also help the children from our workshop, they will also be in the races, we are taking 4 kart.

landuse 09-27-2018 01:13 AM

Looking good chados :thumbsup:


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